Grinding implement



Aug. 19, 1930. JACKSON ET AL 1,773,679

GRINDING IMPLEMENT Filed Aug. 29, 1928 3 Sheets-Sheet l Au 19, 1%0. T, A, JACKSON ET AL 1,773,679

GRINDING IMPLEMENT Filed Aug. 29, 1928 3 Sheets-Sheet 2 Aug. 19, 1930.

T. A. JACKSON ET AL GRINDING IMPLEMENT Filed Aug. 29, 1928 3 Sheets-Sheet 3 mvENToRs: HM BY (575a ATTORNEY Patented Aug. 19, 1930 UNITED STATES PATENT OFFICE THADDEUS A. JACKSON, OF BROOKLYN, AND WILLIAM J, SKELLY, OF NEW YORK, N. Y.

GRINDING IMPLEMENT Application flied August 29, 1928. Serial No. 302,750.

The invention relates to grinding implements and has for its object to provide a. device of the above character which shall perform its work in an accurate and expeditious manner.

A further object of the invention is to obviate some of the objections which are present in commonly used types of devices for grinding drills and the like.

A still further object being to provide a drill grinder of strong, simple, effective construction and of low production cost for high speed work. i

The first and primary feature of this invention is found in the provision of a track having longitudinally and/or laterally inclined portions, said track being formed with projecting side flanges, and for some work it may be straight and inclined throughout its length while for other work the said track may be circular-in plan view, with slightly inclined portions both on the central curved line of the track and laterally thereof for the purpose hereinafter set forth.

In carrying out the invention a carriage or runner carries means whereby it may be slidably held to the said track and on this carriage a grinding wheel is mounted by a hinge joint permitting said wheel to be turned away from a finished drill so that it may be removed and a dull drill placed in asuitable chuck properly positioned to hold a drill while one lip thereof is being sharpened or ground, after which means 'are provided whereby the chuck maybe given a half turn and locked, so that the other or opposite lip of the drill may be ground.

Feeding means are also provided for feed- 40 ing the chuck and its drill to the grinder as required.

For the accomplishment of the above and such further objects as will be apparent to those skilled in this art, the invention consists of the following construction, combination and arrangement of parts hereinafter specifically set forth and illustrated in the accompanying drawings, wherein is shown an illustrative embodiment of the invention, but

it will be understood that changes, variations F'ig. 1, and indicating the extreme positions and modifications may be resorted to, as fall within the scope of the invention claimed.

In the drawings r Fig. 1, is a partial sectional elevation of the improved grinding implement showing the grinding element or wheel in contact with a drill lip at the beginning of the grinding operation.

Fig. 2, is a plan view of the device as in of the grinder by dotted lines.

Fig. 3, is a side elevation of the track shown in Fig. 2, looking in the direction of the arrow A and showing the slightly inclined portions thereof, the degree of the inclinations being exaggerated.

Fig. 4, is a detail elevation of the drill chuck showing a latch whereby it may be locked after a half turn to alternately move the opposite lips of a drill in position for grinding.

Fig. 5, is a diagrammatic elevation showing the grinder at its lowest point on the tail of a drill lip the center of the carriage being on the line 55 of Fig. 2. 5

Fig. 6, is a diagrammatic elevation showing the position of the grinder when the center of the carriage is on the line 6-6 of Fig. 2, the said grinder being raised above the drill to permit of a half rotation of the chuck.

Fig. 7, is a plan view of the improved grinding implement wherein a straight inclined track for the carriage is employed, the finished lips of the drill, when so ground, being plane or flat.

Fig. 8, is a side elevation of the device as shown in Fig. 7, showing more clearly the inclination of the straight track with respect to the lip of the drill. 30

Fig. 9, is a perspective detail of the cutting point of a twist drill, showing a lip flat or plane ground by the device shown in Figs.

7 and 8.

Referring now to the drawings in detail, and to Figs. 1 to 6 inclusive thereof, 10 des ignates a track, here shown as semi-circular, formed with oppositely projecting side flanges 11.

In Fig. 3, 5 and 6 of the drawings, the it track. is shown with the inclined portions greatly exaggerated.

At the point 12, the track is substantially cross-sectionally horizontal, the outer edge of the said track being inclined downwardly from the point 13 at the right of Fig. 3, to the point 14, at the left of said figure. The

inner edge of the track has a horizontal portreatment as indicated in Fig. 5 of the draW- ings.

The inner edge of the track 10, to the right of the point 12, is given a slight upward sweep as at 18, to provide an elevated slightly downwardly and outwardly inclined portion 19, to co-act with a grinder support for raising said grinder clear of the drill point to permit turning the drill for another grinding operation as will be hereinafter described.

Centrally positioned relative to the semicircular track 10, is a drill holding chuck 20, having a reduced portion 21, turnable in a threaded sleeve 22, fixed in a table or platform 23, by a nut or threaded collar 24, said reduced portion 21 being formed with a circumferential groove 25, which is engaged by opposite pins 27, (only one being shown) on a split lever 28, pivoted to a fixed bracket 29 at one end and to a feed screw 30 at the other, the latter passing upwardly through the table 23, and engaging a hand wheel-operated nut The carriage or runner 32 carries a centrally arranged roller 33, which bears on the track 10, and said carriage also carries cages of rollers 34, hearing on the edges of the flanges 11, and preferably carried by heavy leaf springs 35 bolted to the sides of said carriage, are other rollers 36, urged upwardly againstthe underfaces of the said flanges 11, to hold the said roller 33 in intimate contact with the upper face of said track.

Extending upwardlyfrom the carriage 32 is a perforated ear 37 co-operating with a similar perforated ear 38 extending down from a bracket 39 formed with a housing 40 and a bearing 41, to receive a shaft 42, connected at one end to a grinding wheel 43, and at the other end to a gear 44. forming part of a gear group within the housing 40, for driving the grinder through a projecting shaft 45, at high speed. say about 8000 R. P. M. Of course, the grinder may be driven by a mechanical oi electrical motor carried in the housing 40, if desired.

. A handle 46, may be provided for moving the carriage 32, rapidly alo'ng the track as will be understood.

The drill to be ground is shown at 47, and means are provided for imparting a half turn to the chuck and drill when the position of the lips is to be reversed, said means as here shown, comprising a vertically slidable catch 48, operating in guides '49, and adapted to enter one of two opposite notches 50, formed in the table 23.

The perforated ears 37 and 38, may be clamped together to hold the grinder in an adjusted position or they may be released from binding contact to permit the grinder to be moved back to place a dull drill in the chuck by employing a cross bolt 51, (Fig. 8) and a nut 52 as shown.

When it is desired to grind the lips-of a drill fiat or plane, the construction shown in Figs. ,7 and 8 of drawings may be employed.

In this form of grinder the track 10 may be straight but inclined corresponding to the clearance angle of a drill lip, say about 12 degrees, s'aid track being positioned so that the grinder operates in a straight path across one drill lip, after which the chuck 20 and drill 47 are given a half turn by grasping and tilting the handle 60, raising its downwardly directed locking head free of a recess 61 and letting the handle drop so that its head engages the opposite recess 62, (see best Fig. 7). a

The plane or flat lip drill 47 is clearly shown in Fig. 9 of the drawings which form insures rapid penetration in operation.

The carriage 32 in the straight out grinder, rests directly flat on the track 10 and is held in place by suitable gibs 63, secured by screws or bolts 64, and rollers may also be employed.

It is thought that the operation and utility of the device will be apparent without further description. but it may be Well to state that when a drill is placed in the chuck for grinding after throwing the grinder back to the dotted line position of Fig. 1, out of the way, the carriage should be rolled around to the dotted position H, after which the grinder may be lowered and locked by the binding nut 52, after which the handle 46, may be grasped and the carriage rolled around to the dotted position L, after which the carriage is returned to the high position H and the chuck turned half way around by the latch 48 and locked, to present the other lip of the drill to the grinder, after which the carriage is again rolled around to the position L, when the grinding operation is completed.

To provide means for adjusting the angularity of the grinder with respect to the carriage, a butt plate 75, having a slot 76, is held in an'adjusted position by a binding screw 77. The upper end of this plate engages a shoulder 78 of the bracket 39, to maintain said bracket at the proper angle, said bracket being finally locked against relative movement by the bolt 51 and nut 52.

Having thus described the invention, what we claim and desire to secure by Letters Patent is 1. A grinding implement embodying a track, a carriage, a grinder and means for driving it, in combination with means for holding and feeding a drill in a vertical po' sition, the said track being inclined longitudinally and having laterally inclined portions at and near the ends thereof for the purpose set forth.

2. A grinding implement embodying a track inclined in one direction from end to end and gradually and increasingly inclined laterally from near the enter of its length to the opposite ends ereof, a carriage mounted to roll on said track, a rotary grinder and a motor on said carriage and means for looking vertical adjustment of said grindor to a determined operative angle, in combination with a chuck for presenting a drill to said grinder.

3. A grinding implement embod' ing a track inclined longitudinally from en to end in one direction and laterally inclined in an increasing angle from near its center to the ends thereof, said lateral inclinations at the ends being downwardly and outwardly and in opposite directions, a carriage formed with a bracket, a rotary grinder and a motor carried in pivotal relation on said bracket, in combination with a holder for supporting a drill and means for feeding said drill.

Signed at New York, in the'county of New York, and State of New York, this 15th day of August, A. D. 1928.

THADDEUS A. JACKSON. WILLIAM J. SKELLY. 

